As it was, however, Harry kept his counsel, with what results we shall see before long. The trouble with the engines once located, it did not take Percy Simmons long to adjust matters, and within half an hour he had the big motors whirring as evenly as if nothing had ever disturbed the even tenor of their workings.

As soon as he was notified that everything was all right below, Ralph rang for the reverse and the River Swallow backed out from her dock into the darkness that was falling fast. But for the delay, thought Ralph, who had chafed impatiently over it, they might have been in Cardinal by that time. But there was no help for it, and as soon as he had room to turn he sent down a clanging signal to Persimmons for “full speed ahead.”

Harry Ware was on the bridge by the young captain, but after a while he said he thought he smelled gas, and went forward. He wanted to explore the crew’s quarters for himself. Malvin and Hansen were on the lookout stations in the bow, and, as Harry approached the forescuttle, the former came up to him.

“Where are you going, sir?” he asked in a tone that struck Harry as being rather agitated.

“Why, we suspect there’s a leak in one of the gas tanks,” was the boy’s ready reply. “I’m going down there to see if I can locate it.”

“I’ll go, sir,” interrupted Malvin eagerly; “let me go, sir.”

“Don’t bother yourself,” replied Harry; “your place is forward on the lookout. Captain Stetson would be angry if he knew you had left it. You’d better go back.”

Malvin did not obey at once. Instead, he placed his head right over the scuttle, and in a loud voice announced, after a minute of sniffing, that he could smell no fumes of gasoline.

“It’s no use your taking the trouble to go nosing around down there,” he said, turning to Harry. “If the gas was leaking, I’d smell it sure.”

“Nevertheless, I shouldn’t be doing my duty if I didn’t obey Ralph Stetson’s orders,” stoutly declared Harry. “Let me pass; I’m going down. I’d recommend you to get back on your station.”